give the docs issue template a fillable description field

Author: nedbat

.github/ISSUE_TEMPLATE/documentation.yml

@@ -8,6 +8,7 @@ body:
         > [!NOTE]
         > Trivial changes (for example typos) don’t require an issue before opening a PR.
   - type: textarea
+    id: description
     attributes:
       label: "Documentation"
       description: "A clear and concise description of the issue. Include a link to the page."

Doc/improve-page.rst

@@ -47,7 +47,7 @@ You have a few ways to ask questions or suggest changes:
 
 - You can open an issue on the Python GitHub issue tracker. This link will
   create a new pre-populated issue:
-  `Docs: problem with page "PAGETITLE" <https://github.com/python/cpython/issues/new?template=documentation.yml&title=Docs%3A+problem+with+page+%22PAGETITLE%22>`_.
+  `Docs: problem with page "PAGETITLE" <https://github.com/python/cpython/issues/new?template=documentation.yml&title=Docs%3A+problem+with+page+%22PAGETITLE%22&description=The+page+at+PAGEURL+has+a+problem%3A>`_.
 
 - You can `edit the page on GitHub <https://github.com/python/cpython/blob/main/Doc/PAGESOURCE?plain=1>`_
   to open a pull request and begin the contribution process.